hv: seed: refine header file

1. move seed_info structure from trusty.h to seed.h
2. replace "#include <hypervisor.h>" with necessary including headers
   in seed.c/seed_abl.c/seed_sbl.c

Tracked-On: #2777
Signed-off-by: Qi Yadong <yadong.qi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/arch/x86/seed/seed_abl.c

@@ -4,7 +4,10 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <hypervisor.h>
+#include <types.h>
+#include <cpu.h>
+#include <pgtable.h>
+#include <rtl.h>
 #include <seed.h>
 #include "seed_abl.h"